vertical cleavage

• 垂直卵裂(动)

vertical cleavage的用法和样例：

例句

1. This marks the end of the cleavage stage of development.
   这标志着卵裂发育阶段的结束。
2. Cleavage produces a blastula, a sheet of cells rounded into a sphere that in most species surrounds a cavity.
   卵裂产生一个囊胚，形成的细胞壁球形排列形成一个空腔。